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Glacial stratigraphy of the West Estonian Islands comprises three different diamicton units which are correlated event-stratigraphically to the Pandivere and Palivere ice advances of the most recent (Late Weichselian) glaciation and included into the Vörtsjärve Subformation according to Estonian stratigraphic nomenclature. A large number of till samples (1136) and drillcore sections (2500) were analysed in order to determine the genesis and composition of sediments from which the lithostratigraphical conclusions are derived. The two topmost diamictons are interpreted as genetic varieties of the Palivere Till – waterline melt-out and basal till. The Pandivere Till is the lowermost widespread till layer on the islands, which lies unconformably between the Palivere Till and carbonaceous bedrock. Lacustrine Köpu Sands separate the Palivere and Pandivere Tills in a few boreholes on the Köpu and Sörve Peninsulas. In deeply buried valleys on the Sörve Peninsula the Pandivere Till is underlain by lacustrine Viieristi Sands and greenish-grey compact till of unknown age. The correlatives of the Palivere and Pandivere Tills in southern Finland, south of Salpausselkä I (SSI), are thought to be the Espoo and Siuntio Tills, respectively.